[amsat-bb] Re: Listening on USB when operating CW

Rich/wa4bue richard.siff at verizon.net
Fri Feb 7 09:23:18 PST 2014

I am not a constant user of the sats, but I notice this with both some CW 
and SSB transmissions.

Some sats just have drift.

It is still fun.

God Bless


----- Original Message ----- 
From: "Clayton Coleman" <kayakfishtx at gmail.com>
To: "AMSAT-BB" <amsat-bb at amsat.org>
Sent: Friday, February 07, 2014 11:42 AM
Subject: [amsat-bb] Listening on USB when operating CW

>I assume many home station satellite operators utilize some kind of
> full-duplex radio or combination of two radios for CW on the current
> satellites.
> Lately, as I have been listening a lot more with my FUNcube Dongle
> Pro+, I have observed many CW stations drifting across the satellites'
> passband.  I realize this is not a new phenomenon.  I would assume
> these drifting stations are NOT using any type of computer Doppler
> correction.  If they were using computer control, I would assume their
> CW would stay on the same place in the transponder's passband.  It is
> visually apparent when the stations manually make larger frequency
> movements because of the curve displayed on my SDR application's
> waterfall display.
> Many times I have been engaged in a QSO only to have someone CQ'ing on
> CW drift across my existing QSO.  Anyone who operates satellites has
> probably had this happen to them many times.  Sometimes myself or
> others in QSO may try to tell the CW operator "Hello - QSO in
> progress" but it is apparent they are not hearing us.
> My question is, does it make sense for people using CW on the
> satellites to have their receiver set to USB?  Do some operators do
> this?  If listening on a VFO with USB and had your transmit VFO set to
> CW, would this help make it easier for CW ops to know when they have
> drifted into an existing voice QSO?
> 73
> Clayton
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